go into your itunes library and find your songs (windows find your files in Windows Explorer, Mac find in your Music folder in the Finder or right click and click show in finder). open these files with
Audacity (do a google search, when i get home i'll post the home page but its sensored at my school right now >_<)
Then you can choose File > export > AIFF
find the file in your Windows Explorer or in the Finder and simply change the extension from AIFF to CAF.
you should be gtg.
its a little work but simple enough and completely FREE!
Hit thanks if i helped!